Control device of internal combustion engine and control method of internal combustion engine

Abstract

An engine includes a plurality of cylinders and fuel injection valves provided correspondingly to the plurality of respective cylinders. A vehicle includes a motor generator for forcibly rotating a crankshaft. A control device of an internal combustion engine controls the respective fuel injection valves so that an injection quantity of a last injection becomes smaller than an injection quantity of a first injection out of injection quantities of fuel injected in order in correspondence with the respective cylinders in a first cycle of fuel injection from a stopped state of the crankshaft to an end of a first fuel injection from each of the fuel injection valves.

1. A control device of an internal combustion engine mounted on a vehicle, wherein
 the internal combustion engine includes:
 a plurality of cylinders, and 
 fuel injection valves provided correspondingly to the plurality of respective cylinders, 
 the vehicle includes:
 a first rotating electric machine for forcibly rotating a crankshaft of the internal combustion engine, 
 the control device of the internal combustion engine controls the respective fuel injection valves so that an injection quantity of a last injection becomes smaller than an injection quantity of a first injection out of injection quantities of fuel injected in order in correspondence with the respective cylinders in a first cycle of fuel injection from a stopped state of the crankshaft to an end of a first fuel injection from each of the fuel injection valves, 
 
 
 when pressure is substantially equal throughout the plurality of respective cylinders, the control device of the internal combustion engine controls the respective fuel injection valves to increase injection quantity of a last injection in a second cycle. 
 
   
   
     2. The control device of the internal combustion engine according to  claim 1 , wherein
 the first rotating electric machine is formed to be able to rotate the crankshaft of the internal combustion engine at a speed equal to or greater than an idling speed of the internal combustion engine in a stopped state of operation of the internal combustion engine. 
 
   
   
     3. The control device of the internal combustion engine according to  claim 1 , wherein
 the vehicle further includes 
 a second rotating electric machine used together with the internal combustion engine so as to generate torque for rotating a wheel. 
 
   
   
     4. The control device of the internal combustion engine according to  claim 3 , wherein
 the vehicle further includes 
 a power split mechanism having three shafts respectively mechanically coupled to the crankshaft of the internal combustion engine, a rotation shaft of the first rotating electric machine, and a rotation shaft of the second rotating electric machine, and formed so that, if rotation speeds of any two of the three shafts are determined, a rotation speed of residual shaft is forcibly determined. 
 
   
   
     5. The control device of the internal combustion engine according to  claim 1 , wherein
 the control device controls a control variable of the internal combustion engine different from the fuel injection quantity at a constant value until negative pressure in an intake pipe of the internal combustion engine is stabilized. 
 
   
   
     6. The control device of the internal combustion engine according to  claim 5 , wherein
 the control variable of the internal combustion engine includes an advance angle of a variable valve opening timing. 
 
   
   
     7. The control device of the internal combustion engine according to  claim 5 , wherein the control variable of the internal combustion engine includes a valve opening angle of a throttle valve. 
   
   
     8. The control device of the internal combustion engine according to  claim 5 , wherein the control device retains angle information on the crankshaft at a stop time of the internal combustion engine and determines the constant value of the control variable based on the retained angle information. 
   
   
     9. A control method of an internal combustion engine which is mounted on a vehicle including a first rotating electric machine, and which includes a plurality of cylinders, fuel injection valves provided correspondingly to the plurality of respective cylinders, and a crankshaft, the crankshaft being forcibly rotated by the first rotating electric machine, the method comprising the steps of:
 determining whether or not it is a first cycle of fuel injection from a stopped state of the crankshaft to an end of a first fuel injection from each of the fuel injection valves; 
 determining injection quantities of fuel injected in order in correspondence with the plurality of cylinders so that an injection quantity of a last injection in the first cycle becomes smaller than an injection quantity of a first injection in the first cycle; 
 determining when a pressure throughout the plurality of cylinders is substantially equal; and 
 increasing the injection quantity in the last injection in a second cycle when the pressure throughout the plurality of cylinders is substantially equal. 
 
   
   
     10. The control method of the internal combustion engine according to  claim 9 , wherein
 the first rotating electric machine is formed to be able to rotate the crankshaft of the internal combustion engine at a speed equal to or greater than an idling speed of the internal combustion engine in a stopped state of operation of the internal combustion engine. 
 
   
   
     11. The control method of the internal combustion engine according to  claim 9 , wherein
 the vehicle further includes 
 a second rotating electric machine used together with the internal combustion engine so as to generate torque for rotating a wheel. 
 
   
   
     12. The control method of the internal combustion engine according to  claim 11 , wherein
 the vehicle further includes 
 a power split mechanism having three shafts respectively mechanically coupled to the crankshaft of the internal combustion engine, a rotation shaft of the first rotating electric machine, and a rotation shaft of the second rotating electric machine, and formed so that, if rotation speeds of any two of the three shafts are determined, a rotation speed of residual shaft is forcibly determined. 
 
   
   
     13. The control method of the internal combustion engine according to  claim 9 , the method further comprising the steps of:
 determining whether or not negative pressure in an intake pipe of the internal combustion engine has been stabilized; and 
 controlling a control variable of the internal combustion engine different from the fuel injection quantity at a constant value when the negative pressure has not been stabilized. 
 
   
   
     14. The control method of the internal combustion engine according to  claim 13 , wherein
 the control variable of the internal combustion engine includes an advance angle of a variable valve opening timing. 
 
   
   
     15. The control method of the internal combustion engine according to  claim 13 , wherein
 the control variable of the internal combustion engine includes a valve opening angle of a throttle valve. 
 
   
   
     16. The control method of the internal combustion engine according to  claim 13 , the method further comprising the step of retaining angle information on the crankshaft at a stop time of the internal combustion engine, wherein
 the controlling step determines the constant value of the control variable based on the retained angle information.